How do I set up CC2650 8Kb cache as RAM using IAR?

Hugo Mendez

Other Parts Discussed in Thread: BLE-STACK

Hello,

I'm trying to use the 8Kb cache area as general purpose RAM but I'm obviously missing something. I modified the config file to allow the use of it as GPRAM. I also modified the linker to include the 0x11000000-0x11001FFF range for readwrite data. When I did manage to place readwrite data in that region my app didn't run correctly. In fact, it never run to main() on the debugger.

I am using TI-RTOS 2.18 and BLE Stack 2.2.0.

//#####################################
// Select between cache or GPRAM
//#####################################
#ifndef SET_CCFG_SIZE_AND_DIS_FLAGS_DIS_GPRAM
#define SET_CCFG_SIZE_AND_DIS_FLAGS_DIS_GPRAM 0x0 // Cache is disabled and GPRAM is available at 0x11000000-0x11001FFF
// #define SET_CCFG_SIZE_AND_DIS_FLAGS_DIS_GPRAM 0x1 // Cache is enabled and GPRAM is disabled (unavailable)
#endif

Thanks.

over 10 years ago

0 YiKai Chen over 10 years ago

Guru 735705 points

You can refer to the discussions in e2e.ti.com/.../507034

0 JXS over 10 years ago in reply to YiKai Chen

TI__Guru** 105180 points

Also,

Please make sure the following is set in main:
/* Keep cache powered during sleep */
Power_setConstraint(PowerCC26XX_SB_VIMS_CACHE_RETAIN);
Power_setConstraint(PowerCC26XX_NEED_FLASH_IN_IDLE);

(assuming BLE-Stack v2.2.0).

If you are not reaching main, perhaps something is amiss in your linker setup. Try removing your linker cmd file changes and do a direct access to GPRAM to confirm the GPRAM settings are correct.

Best wishes

0 Hugo Mendez over 10 years ago in reply to JXS

Prodigy 110 points

Thank you for the suggestions. We ended up using the GPRAM for Task stacks and that seems to be working.

We added the power constraints, which make sense to have, however it seemed to be working before we added them as well.

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How do I set up CC2650 8Kb cache as RAM using IAR?